Question

in the 1950s, tall smokestacks for factories were constructed to release pollution higher in the atmosphere. the motto during this time was \the solution to pollution is:\ revolution confusion evolution dilution

Explanation:

In the 1950s, the idea was that by releasing pollution higher in the atmosphere (tall smokestacks), it would be diluted. "Dilution" means making something less concentrated by adding a solvent (in this case, the atmosphere acting as a 'solvent' for pollutants). The other words: "revolution" (a major change), "confusion" (lack of clarity), "evolution" (gradual development) do not fit the context of dealing with pollution by spreading it out (diluting).

Answer:

dilution